Their Divinity 2: Original Sin is very highly praised in the CRPG world, and is one of the oft-touted "spiritual successors" to Baldur's Gate.
While I have some queries regarding them (their games do have a lot of humour and while that was also true of BG, it was not to the detriment of the darker aspects of the series), they would have been one of my main choices, along with Obsidian and maybe Beamdog, before most of the old crew subsequently left again. In fact, it seems very likely that Beamdog also made the BG3 pitch but, for whatever reasons, didn't make the cut, leading to those departures.
They don't intend to use the Infinity Engine, which is probably a good thing, and from the sound of it they've had success at translating the 5E ruleset, a modified version of which will be used for the game, into the engine.
It also sounds like, in addition to having something to do with mind flayers, perhaps referencing the abandoned BG2 plotline involving Athkatla, the slave trade, the illithids and the Twisted Rune, the plot will heavily lean on the 5E modules that have already dealt with the return of Bhaal, the "Murder in Baldur's Gate" one and an upcoming one from later this year, "Descent into Avernus". Basically, Gorion's Ward cannonically murdered or was killed by Viekang (the teleporting Bhaalspawn from BG2 and Throne of Bhaal), leading to the victor transforming into the Ravager and being killed by a group of adventurers, leading to Bhaal's resurrection. So Bhaal's already back, seized the murder domain from Cyric and seems to be involving himself in the Blood War to some capacity.